Ancestral Arts. You gain proficiency with Construction tools. Double your PB for any ability check you make that uses them. You also gain proficiency with one type of martial weapon of your choice.
Eye for Quality. When you make an ability check related to the origin or purpose of an object or structure made of metal or stone, you can add your PB to the roll. If you have proficiency in a relevant skill or tool, double your PB for the roll.
Languages. You know Common and one additional language of your choice. Typical stone heritage characters choose Dwarvish.